Quantitative Aptitude - Arithmetic Ability Questions

The standard deviation of the set {10, 11, 12, 9, 8} is

Select the odd letters from the given alternatives.

Select the odd word/letters/number/number pair from the given alternatives.

The value of 2.31 x 0.34 = ?

The rate of simple interest for which a sum of money becomes 5 times in 8 years is

Which of the following is the largest number among 2, 33, 4, 53

Two valves P and B can fill a sump in 37.5 minutes and 45 minutes respectively. Both valves are opened. The sump will be filled in just 30 minutes, if valve B is turned off after

A person goes from point N to P and comes back. His average speed for the whole journey is 60 km/hr. If his speed while going from N to P is 40 km/hr, then what will be the speed of the person (in km/hr) while coming back from P to N?